Corn-knife.



J. C. 'PLETSGHER.

CORN KNIFE. APPLICATION l nmn sum. 28, mo.

9945534. Patented June 6, 1911.

JOHN c. rLErscHER, or BALTIMORE, MARYLAND.

} i CORN-KNIFE.

Specification of Letters Patent. Patented J 11116 6, 1911.

Application filed September 28, 1910. Serial No. 584,180.

To all whom it may concern: I

Be it known that I, JOHN C. PLETSOHER, a citizen of the United States,residing at Baltimore, in the State of Maryland, have invented certainnew and useful Improve-' ments in CornKnives, of which the following isa specification.

This invent-ion relates to a safety knife and has particular referenceto a knife for paring or trimming corns and other callous places on theskin,the object being to provide a knife that may be used with safety;which will make a draw out and which may be constructed in a simple andinexpensive manner. 7

Another object is to provide an improved form of curved cutting bladeand guard whereby to enable the blade to effect an entrance into theskin at a: small portion of its cutting edge and to thereafter increasethe cutting surface as the blade is drawn forward.

Another object is to provide an improved means for detachably securingthe blade guard and handle together.

With these and other objects in view, the invention is illustrated inthe accompanying drawing, in which,-

Figure 1, is a side elevation of the improved knife; Fig. 2, alongitudinal sectional detail through the lower end of the handle, guardand blade; Fig. 3, isa sectional plan view of the guard'and blade, thesect-ion being taken on the line 33 of Fig. 2. Fig. d, is a bottom planof the lower end of the knife; Figs. 5, 6 and 7 are top plan viewsrespectively of the clamp plate, center blade and holder, and Fig. 8, isa sectional detail of the several parts ready for assembling.

Referring to the drawing the numeral, 1, designates a tubular handlehaving laterally-curved arms, 2, at one end thereof which carry ahead-plate, 3. This head-plate has a broadened front extension, 4, and abroadened rear extension, 5,-said broadened ends or extensions being atopposite sides of the point of joinder of the arms, 2, with a narrowpart of the head plate. The rear'extension, 5, of the head platehas arounded edge, 6, and is also provided with a crescentshaped slot, 7,whose convex edge curves coincidently with said round edge, 6, and formsa curved bar that serves as a guard for the curved edge of the cutterblade. A

perforation, 8, is provided in the head plate in front of the arms, 2,for a purpose pres- V ently to be described. A clamping plate,

9, is also employed in the make-up of the knife and is preferably formedof a thin yielding metal. This plate has an upturned flange, 10, at itsfront end and a rounded-or'cu'rved rear edge, 11. A stud, 12, is alsoprovided on t-he'cl'amping plate and projects upwardly therefrom andsaid stud has an enlarged or headed upper end, 13; a reducedintermediate portion, 14, and a circular enlargement, 15, directly overthe upper surface of the clamping plate as clearly shown in Fig. 8. 1The rear rounded or curved edge, 11, of the clampingplate has a slightupward curve in a longitudinal direction, for a purpose presently to beexplained.

The cutter blade, 16, is formed from a thin steel plate and has astraight front edge, 17, and a rounded or curved rear cutting edge, 18.This blade also has aperforation, 19, adjacent to the straight frontedgeand the location of this perforation is such that the head, 13, and theenlargement, 15, of

the stud on the clamping plate, 9, may both pass therethrough and permitthe blade to lie flat on theupper surface of the clam ing plate 9 withthe straight front edge, 1 abutted against the up-turned flange, 10, onthe front of the clamping plate. When in this position the perforation,19, in the blade will receive the said enlargement, 15, of the stud andby this means the rounded cutting edge, 18, of the blade is definitelypositioned with respect to the curved slot, 7, and the curved guard bar,6, and the cutter-blade will be prevented from turning about the stud. Alocking plate, 20, has at one end an upturned flange, 21, forconvenience of handling the plate and is provided with a central slot,22, that extends longitudinally and is open at one end and this slotforms two parallel prongs, 23, which are separated by the said slot, 22.I

In assembling the several parts of the knife the blade, 16, is firstseated on the clamp plate, 9,the stud of the latter projecting throughthe perforation, 19, of the blade. The head plate, 3, is then seateddown on top of the blade so that the stud will project through theperforation, 8, and the front edge of the end, 4:, will abut against theflange, 10, of the clamp plate, which flange is of suflicient height toproject above the blade and the head plate, as

clearly seen in Figs. 1 and 2. This arrangement of the several partswill cause the head, 13, of the stud on the bottom-most clamp-plate toproject above the upper surface of the head plate. The parts being thusassembled should be pressed together, and while thus pressed the lockingplate, 20, will be put in position by the prongs, 23, thereof beinginserted between the stud head, 13, and the upper surface of theheadplate, 3,-the said two prongs taking on opposite sides of thereduced portion, 14:, of the stud. As will be seen the construction ofthe handle with two curved arms, 2, per mits the two prongs, 23, of thelocking plate to have position in the space between said two curvedarms. hen the pressure is removed from the parts their tendency to react and spring apart will hold the locking plate from slipping out, andthe locking plate will confine said parts.

Having thus described my invention what I claim and desire to secure byLetters Pat ent is,

1. A corn-paring safety knife comprising a handle having two curved armswhose extremities are permanently attached to a head plate provided witha perforation, 8; a blade having opposite its cutting edge a straightcross-edge, 17, and a perforation, 19; a clamping plate provided with apermanently-attached stud and having at one end an upturned flange, 10,which abuts against the said straight cross-edge of the blade and thesaid stud projecting through the perforations in both the blade and headplate, and a locking plate having two parallel prongs which engage thesaid stud and have position between the said two arms of the handle.

2. A corn-paring safety knife having a handle provided with a curvedextremity; a head plate permanently attached to said curved extremityand having a crescentshaped slot and a curved guard-bar which iscoincident with the convex edge of said slot; a cutter blade having arounded cutting edge which is positioned partly over saidcrescent-shaped slot; and a plate below the said cutter blade said lastnamed plate having a stud for binding the said parts together.

In testimony whereof I affix my signature in presence of two witnesses.

JOHN C. PLETSCHER.

Vitnesses CHARLES E, MANN, J r., John W, H'EwEs. I

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, "Washington, D. C.

